Stand base



FIG. 1 is a perspective view of a stand base embodying the present invention;

FIG. 2 is a plan view of the stand base;

FIG. 3 is a bottom view of the stand base;

FIG. 4 is a side elevational view of the stand base on a first axis, the stand base being identical when viewed on axes displaced 120° therefrom;

FIG. 5 is a side elevational view of the stand base on a second axis displaced 60° from the first axis, the stand base being identical when viewed on axes displaced 120° from the second axis; and,

FIG. 6 is a perspective view of the stand base, shown with a microphone stand which is shown in broken lines for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a stand base, as shown and described. 